Class: Slim::Wrapper

Inherits:
Object
  • Object
show all
Defined in:
lib/slim/wrapper.rb

Overview

For logic-less mode, objects can be encased in the Wrapper class.

For Rails, this allows us to use the environment provided for rendering a view including the instance variables, view helper and application helper methods.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(value, parent = nil) ⇒ Wrapper

Returns a new instance of Wrapper.



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# File 'lib/slim/wrapper.rb', line 10

def initialize(value, parent = nil)
  @value, @parent = value, parent
end

Instance Attribute Details

#parent ⇒ Object (readonly)

Returns the value of attribute parent.



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# File 'lib/slim/wrapper.rb', line 8

def parent
  @parent
end

#value ⇒ Object (readonly)

Returns the value of attribute value.



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# File 'lib/slim/wrapper.rb', line 8

def value
  @value
end

Instance Method Details

#[](name) ⇒ Object

To find the reference, first check for standard method access by using respond_to?.

If not found, check to see if the value is a hash and if the the name is a key on the hash.

Not a hash, or not a key on the hash, then check to see if there is an instance variable with the name.

If the instance variable doesn’t exist and there is a parent object, go through the same steps on the parent object. This is useful when you are iterating over objects.



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# File 'lib/slim/wrapper.rb', line 26

def [](name)
  if value.respond_to?(name)
    wrap value.send(name)
  elsif value.respond_to?(:has_key?) && value.has_key?(name.to_sym)
    wrap value[name]
  elsif value.instance_variable_defined?("@#{name}")
    wrap value.instance_variable_get("@#{name}")
  elsif parent
    parent[name]
  end
end

#empty? ⇒ Boolean

Empty objects must appear empty for inverted sections

Returns:

  • (Boolean) 


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# File 'lib/slim/wrapper.rb', line 39

def empty?
  value.respond_to?(:empty) && value.empty?
end

#to_s ⇒ Object

Used for output



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# File 'lib/slim/wrapper.rb', line 44

def to_s
  value.to_s
end